How many movies have Masami Otsuka and Masanao Okubo collaborated on?

They have worked on 3 movies together! Their first movie together was Crayon Shin-chan the Movie: The Tornado Legend of Ninja Mononoke (2022) and was their highest rated movie together. They have not worked together since Doraemon the Movie: Nobita's Earth Symphony (2024). They are most known for their animation films together.